www/h2o: Unbreak: build and install libraries that this project builds by default

Port changes:

• Remove -DWITHOUT_LIBS=ON: the project builds libs by default, and has "it can also be used as a library" in its description. If desired, the option NOLIBS can potentially be created.
• Remove stray -DEXTRA_LIBRARIES=OFF: EXTRA_LIBRARIES doesn't exist in the CMakeLists.txt

Approved by: portmgr